Pheidole caltrop

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Pheidole caltrop
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Pheidole
Species: P. caltrop
Binomial name
Pheidole caltrop
Wilson, 2003

Pheidole caltrop casent0619558 p 1 high.jpg

Pheidole caltrop casent0619558 d 1 high.jpg

Specimen Labels

“From large thorns hollowed out on living tree” (A. E. Emerson, collection note 13 April 1935). (Wilson 2003)


See the description in the nomenclature section.

Keys including this Species


Known from Costa Rica and Panama.

Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica, Honduras, Panama (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb







The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • caltrop. Pheidole caltrop Wilson, 2003: 270, figs. (s.w.) PANAMA.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.


A unique member of the fallax group characterized as follows.

Major: yellow; occiput, genae, and promesonotal dorsum rugoreticulate; large “sharkfin” protrusion on humerus extends beyond the boundaries of the rest of the pronotum when viewed from above; dorsum of postpetiolar node carinulate.

Minor: large “sharkfin” angle protrudes from humerus; all of body except gaster foveolate and opaque; very thin nuchal collar present.

MEASUREMENTS (mm) Holotype major: HW 1.22, HL 1.18, SL 0.64, EL 0.14, PW 0.62. Paratype minor: HW 0.60, HL 0.66, SL 0.66, EL 0.10, PW 0.42.

COLOR Major: concolorous dark yellow.

Minor: concolorous medium yellow.

Pheidole caltrop Wilson 2003.jpg

Figure. Upper: holotype, major. Lower: paratype, minor. Scale bars = 1 mm.

Type Material

PANAMA: Barro Colorado Island, col. Alfred E. Emerson. Museum of Comparative Zoology


ML caltrop, a four-pointed weapon placed on the ground to impede movement.